Gurikar wrote:

> Is it valid to send only patient name as query parameter without
> patient id( its present,but NULL) in a patient root patient level. I
> mean can i query using patient name??

Sure, that is what the query is for.

Indeed you can do this with a study root query as well at the study
level (i.e. leaving the study-specific query keys zero length if
you want them returned rather than matched).

It is only at the lower levels in the query model in a hierarchical
query that one must specify unique values for patient/study keys
(Patient ID and Study Instance UID respectively).

David